1 // SPDX-License-Identifier: GPL-2.0
6 #include <asm/tlb.h>
11 phys_addr_t physical_mask __ro_after_init = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;
24 void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)  in paravirt_tlb_remove_table()  argument
29 	tlb_remove_page(tlb, ptdesc_page(ptdesc));  in paravirt_tlb_remove_table()
33 void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)  in paravirt_tlb_remove_table()  argument
35 	tlb_remove_table(tlb, table);  in paravirt_tlb_remove_table()
50 		return -EINVAL;  in setup_userpte()
59 		return -EINVAL;  in setup_userpte()
64 void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte)  in ___pte_free_tlb()  argument
67 	paravirt_tlb_remove_table(tlb, page_ptdesc(pte));  in ___pte_free_tlb()
71 void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)  in ___pmd_free_tlb()  argument
75 	 * NOTE! For PAE, any changes to the top page-directory-pointer-table  in ___pmd_free_tlb()
79 	tlb->need_flush_all = 1;  in ___pmd_free_tlb()
81 	paravirt_tlb_remove_table(tlb, virt_to_ptdesc(pmd));  in ___pmd_free_tlb()
85 void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)  in ___pud_free_tlb()  argument
88 	paravirt_tlb_remove_table(tlb, virt_to_ptdesc(pud));  in ___pud_free_tlb()
92 void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)  in ___p4d_free_tlb()  argument
95 	paravirt_tlb_remove_table(tlb, virt_to_ptdesc(p4d));  in ___p4d_free_tlb()
105 	list_add(&ptdesc->pt_list, &pgd_list);  in pgd_list_add()
112 	list_del(&ptdesc->pt_list);  in pgd_list_del()
123 	virt_to_ptdesc(pgd)->pt_mm = mm;  in pgd_set_mm()
128 	return page_ptdesc(page)->pt_mm;  in pgd_page_get_mm()
134 	   ptes in non-PAE, or shared PMD in PAE), then just copy the  in pgd_ctor()
162  * List of all pgd's needed for non-PAE so it can invalidate entries
165  * tactic would be needed. This is essentially codepath-based locking
169  * -- nyc
174  * In PAE mode, we need to do a cr3 reload (=tlb flush) when
175  * updating the top-level pagetable entries to guarantee the
177  * all 4 top-level entries are used almost immediately in a
178  * new process's life, we just pre-populate them here.
188  * We allocate separate PMDs for the kernel part of the user page-table
189  * when PTI is enabled. We need them to map the per-process LDT into the
190  * user-space page-table.
205 	 * According to Intel App note "TLBs, Paging-Structure Caches,  in pud_populate()
206 	 * and Their Invalidation", April 2007, document 317080-001,  in pud_populate()
208 	 * TLB via cr3 if the top-level pgd is changed...  in pud_populate()
214 /* No need to prepopulate any pagetable entries in non-PAE modes. */
267 		return -ENOMEM;  in preallocate_pmds()
393 	 * page for pgd. We are able to just allocate a 32-byte for pgd.  in pgtable_cache_init()
394 	 * During boot time, we create a 32-byte slab for pgd table allocation.  in pgtable_cache_init()
411 	 * a 32-byte slab for pgd to save memory space.  in _pgd_alloc()
447 	mm->pgd = pgd;  in pgd_alloc()
461 	 * Make sure that pre-populating the pmds is atomic with  in pgd_alloc()
529 		 * We had a write-protection fault here and changed the pmd  in pmdp_set_access_flags()
530 		 * to to more permissive. No need to flush the TLB for that,  in pmdp_set_access_flags()
532 		 * worst-case we'll generate a spurious fault.  in pmdp_set_access_flags()
549 		 * We had a write-protection fault here and changed the pud  in pudp_set_access_flags()
550 		 * to to more permissive. No need to flush the TLB for that,  in pudp_set_access_flags()
552 		 * worst-case we'll generate a spurious fault.  in pudp_set_access_flags()
567 					 (unsigned long *) &ptep->pte);  in ptep_test_and_clear_young()
604 	 * On x86 CPUs, clearing the accessed bit without a TLB flush  in ptep_clear_flush_young()
609 	 * So as a performance optimization don't flush the TLB when  in ptep_clear_flush_young()
660  * reserve_top_address - reserves a hole in the top of kernel address space
661  * @reserve - size of hole to reserve
670 	__FIXADDR_TOP = round_down(-reserve, 1 << PMD_SHIFT) - PAGE_SIZE;  in reserve_top_address()
672 	       -reserve, __FIXADDR_TOP + PAGE_SIZE);  in reserve_top_address()
711  * p4d_set_huge - setup kernel P4D mapping
713  * No 512GB pages yet -- always return 0
721  * p4d_clear_huge - clear kernel P4D mapping when it is set
723  * No 512GB pages yet -- always return 0
731  * pud_set_huge - setup kernel PUD mapping
734  * function sets up a huge page only if the complete range has the same MTRR
737  * Callers should try to decrease page size (1GB -> 2MB -> 4K) if the bigger
750 	/* Bail out if we are we on a populated non-leaf entry: */  in pud_set_huge()
762  * pmd_set_huge - setup kernel PMD mapping
774 …pr_warn_once("%s: Cannot satisfy [mem %#010llx-%#010llx] with a huge-page mapping due to MTRR over…  in pmd_set_huge()
779 	/* Bail out if we are we on a populated non-leaf entry: */  in pmd_set_huge()
791  * pud_clear_huge - clear kernel PUD mapping when it is set
806  * pmd_clear_huge - clear kernel PMD mapping when it is set
822  * pud_free_pmd_page - Clear pud entry and free pmd page.
826  * Context: The pud range has been unmapped and TLB purged.
850 	/* INVLPG to clear all paging-structure caches */  in pud_free_pmd_page()
851 	flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);  in pud_free_pmd_page()
869  * pmd_free_pte_page - Clear pmd entry and free pte page.
873  * Context: The pmd range has been unmapped and TLB purged.
883 	/* INVLPG to clear all paging-structure caches */  in pmd_free_pte_page()
884 	flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);  in pmd_free_pte_page()
894  * Disable free page handling on x86-PAE. This assures that ioremap()
895  * does not update sync'd pmd entries. See vmalloc_sync_one().
907 	if (vma->vm_flags & VM_SHADOW_STACK)  in pte_mkwrite()
917 	if (vma->vm_flags & VM_SHADOW_STACK)  in pmd_mkwrite()
934 	VM_WARN_ON_ONCE(!(vma->vm_flags & VM_SHADOW_STACK) &&  in arch_check_zapped_pte()
941 	VM_WARN_ON_ONCE(!(vma->vm_flags & VM_SHADOW_STACK) &&  in arch_check_zapped_pmd()
948 	VM_WARN_ON_ONCE(!(vma->vm_flags & VM_SHADOW_STACK) && pud_shstk(pud));  in arch_check_zapped_pud()